A power semiconductor module includes an insulating substrate, conductor patterns and a power semiconductor element. The conductor patterns are formed on both surfaces of the insulating substrate. The power semiconductor element is mounted on the conductor patterns. The conductor patterns include an anode terminal connection portion and a cathode terminal connection portion. A circuit is formed such that a current that flows between the anode terminal connection portion and the cathode terminal connection portion via the power semiconductor element flows on the both surfaces of the insulating substrate.